Table 1: Effect of catalyst amount on the reactiona.

634510.fig.002

EntryCatalyst amount (mol%) (min)Yield (%)b

13025
211063
321076
43291
54290

Reaction conditions: phthalhydrazide (1 mmol), dimedone (1 mmol), and benzaldehyde (1 mmol), ground at room temperature.
bIsolated yields.